Haversine Formula for finding the distance between two points in a sphere.
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Haversine Formula
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| function (){ | |
| for( | |
| var m = Math // reassign Math & some of its functions | |
| , c = m.cos | |
| , s = m.sin | |
| , a = arguments | |
| , i=4; // The arguments variable is expected to have at least 4 variables. | |
| // I am going to use this to count down, so when it hits 0 the loop ends. | |
| i; | |
| ) | |
| a[--i] *= m.PI/180; // converts to radian | |
| return m.acos( // the glorious haversine formula | |
| c(a[0])* | |
| c(a[2])* | |
| c(a[3]-a[1])+ | |
| s(a[0])* | |
| s(a[2]) | |
| ); | |
| } |
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| function(){for(var m=Math,c=m.cos,s=m.sin,a=arguments,i=4;i;)a[--i]*=m.PI/180;return m.acos(c(a[0])*c(a[2])*c(a[3]-a[1])+s(a[0])*s(a[2]))} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "haversineFormula", | |
| "description": "Haversine Formula", | |
| "keywords": [ | |
| "haversine", | |
| "distance", | |
| "sphere", | |
| "geolocation" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>Haversine Formula</title> | |
| <div>Expected value: <b>0.017453292519941554</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| var myFunction = function(){for(var m=Math,c=m.cos,s=m.sin,a=arguments,i=4;i;)a[--i]*=m.PI/180;return m.acos(c(a[0])*c(a[2])*c(a[3]-a[1])+s(a[0])*s(a[2]))} | |
| document.getElementById( "ret" ).innerHTML = myFunction(0,0,0,1); | |
| </script> |
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